/// <summary>
/// Returns all code fragments in the specified file that overlap with the given range.
/// Returns an empty sequence if any of the given arguments is null.
/// </summary>
private static IEnumerable <CodeFragment> FragmentsOverlappingWithRange(this FileContentManager file, LSP.Range range)
{
if (file == null || range?.Start == null || range.End == null)
{
return(Enumerable.Empty <CodeFragment>());
}
var(start, end) = (range.Start.Line, range.End.Line);
var fragAtStart = file.TryGetFragmentAt(range.Start, out var _, includeEnd: true);
var inRange = file.GetTokenizedLine(start).Select(t => t.WithUpdatedLineNumber(start)).Where(ContextBuilder.TokensAfter(range.Start)); // does not include fragAtStart
inRange = start == end
? inRange.Where(ContextBuilder.TokensStartingBefore(range.End))
: inRange.Concat(file.GetTokenizedLines(start + 1, end - start - 1).SelectMany((x, i) => x.Select(t => t.WithUpdatedLineNumber(start + 1 + i))))
.Concat(file.GetTokenizedLine(end).Select(t => t.WithUpdatedLineNumber(end)).Where(ContextBuilder.TokensStartingBefore(range.End)));
var fragments = ImmutableArray.CreateBuilder <CodeFragment>();
if (fragAtStart != null)
{
fragments.Add(fragAtStart);
}
fragments.AddRange(inRange);
return(fragments.ToImmutableArray());
}